Author: jhb
Date: Thu Feb 6 21:46:15 2020
New Revision: 357643
URL: https://svnweb.freebsd.org/changeset/base/357643
Log:
Tidy the _set_tp function for RISC-V.
- Use a constant for the offset instead of a magic number.
- Use an addi instruction that writes to tp directly instead of a mv
that writes the result of a compiler-generated addi.
Reviewed by: mhorne
MFC after: 1 week
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D23521
Modified:
head/lib/libc/riscv/gen/_set_tp.c
Modified: head/lib/libc/riscv/gen/_set_tp.c
==============================================================================
--- head/lib/libc/riscv/gen/_set_tp.c Thu Feb 6 21:01:19 2020
(r357642)
+++ head/lib/libc/riscv/gen/_set_tp.c Thu Feb 6 21:46:15 2020
(r357643)
@@ -38,13 +38,14 @@ __FBSDID("$FreeBSD$");
#include <string.h>
#include <sys/types.h>
-#include <machine/sysarch.h>
-
#include <stdlib.h>
+/* NB: size of 'struct tcb'. */
+#define TP_OFFSET (sizeof(void *) * 2)
+
void
_set_tp(void *tp)
{
- __asm __volatile("mv tp, %0" :: "r"((char*)tp + 0x10));
+ __asm __volatile("addi tp, %0, %1" :: "r" (tp), "I" (TP_OFFSET));
}
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